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[2x]
: P- P. P/ P< Pa Pb Pc Pd Pe Pf Ph Pi Pj Pk Pl Pm Pn Po Pp Pr Ps Pt Pu Pv Pw Px Py
penstock | pent | pent up | pent- | pent-up | penta- | pentabasic | pentacapsular | pentachenium | pentachloride | pentachord

penta-

CIDE DICTIONARY

penta-pref. [Gr. penta-, a later combining form of pe`nte five. See Five.].
  •  A combining form denoting five; as, pentacapsular; pentagon.  [1913 Webster]
  •  Denoting the degree of five, either as regards quality, property, or composition; as, pentasulphide, containing five sulfur atoms; pentoxide, containing five oxygen atoms, etc. Also used adjectively.  [1913 Webster]

OXFORD DICTIONARY

penta-, comb. form 1 five.
2 Chem. (forming the names of compounds) containing five atoms or groups of a specified kind (pentachloride; pentoxide).

Etymology
Gk f. pente five

For further exploring for "penta-" in Webster Dictionary Online


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